I'm having difficulty using multiple visualizations with Ext GWT. Within a TabItem, I have 3 vertical panels, each with a separate Google Visualization (BarChart, AnnotatedTimeLine, IntensityMap).

The hierarchy is like this:

TabItem
-->VerticalPanel
---->Visualization Component

When the page is displayed, the AnnotatedTimeLine and IntensityMap visualizations appear but the BarChart does not. When I select a different tab and then return to the tab that contains the visualizations, they appear briefly. Navigating to a different tab, however, causes the BarChart to disappear.

PieChart also exhibits the same behavior.

Is there a different containment hierarchy that I should follow to get this to work?